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Prestack nonstationary deconvolution based on variable-step sampling in the radial trace domain |
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| Authors: | Fang Li Shou-Dong Wang Xiao-Hong Chen Guo-Chang Liu Qiang Zheng |
| Institution: | 1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249, China 2. CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing, 102249, China 3. National Engineering Laboratory of Offshore Oil Exploration, China University of Petroleum, Beijing, 102249, China 4. CNOOC Research Institute, Beijing, 100027, China |
| Abstract: | The conventional nonstationary convolutional model assumes that the seismic signal is recorded at normal incidence. Raw shot gathers are far from this assumption because of the effects of offsets. Because of such problems, we propose a novel prestack nonstationary deconvolution approach. We introduce the radial trace (RT) transform to the nonstationary deconvolution, we estimate the nonstationary deconvolution factor with hyperbolic smoothing based on variable-step sampling (VSS) in the RT domain, and we obtain the high-resolution prestack nonstationary deconvolution data. The RT transform maps the shot record from the offset and traveltime coordinates to those of apparent velocity and traveltime. The ray paths of the traces in the RT better satisfy the assumptions of the convolutional model. The proposed method combines the advantages of stationary deconvolution and inverse Q filtering, without prior information for Q. The nonstationary deconvolution in the RT domain is more suitable than that in the space-time (XT) domain for prestack data because it is the generalized extension of normal incidence. Tests with synthetic and real data demonstrate that the proposed method is more effective in compensating for large-offset and deep data. |
| Keywords: | Nonstationary deconvolution Variable-step sampling Radial trace transform Gabor transform Attenuation compensation |
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